Sliding over docking port

[Cannon]

So I'm trying to dock a huge ship with my asteroid station and whenever I get docking ports together, instead of connecting, the ship just slides over it and gets thrown away. Velocity relative to target is 0.1m/s.
I usually fix this by quicksaving and loading but it doesn't work this time sadly.
What should I do? Thanks in advance!
EDIT: Here's what it looks like https://streamable.com/x5r2r

Edited December 19, 2018 by Cannon

[Superfluous J]

Looks like maybe your ports (or one of them) think they're (it's) docked already. How comfortable are you looking though a persistent.sfs file?

With the ships far enough apart that they're not in immediate likelihood of docking, look through your save file for "Acquired". This State on any docking port could keep it from trying to dock (as it thinks it already is). Change it to "Ready" and see if that helps.

And by ALL means back up your save first.

[bewing]

Do you have an unmodded copy of the game stored somewhere on your machine? It looked like there was "negative magnetism" forcing the two docking ports apart? I'm going to blame that on one of your mods.

 

[GoatRider]

Usually when that happens I find I'm not squared up on the port. If I hit close it sticks a bit magnetically, and sometimes I can gently use the reaction control wheels to line up, but usually I just have to back up a bit and try harder to get it lined up better. Usually what I do is switch to the station and "control from" the docking port and line it up, then back to the ship. Then I don't have to do all that fiddly RCS side to side stuff which is quite disorienting.

[OHara]

Assuming your save-file shows the docking ports as 'ready' as they should be . . .
Something very similar has occasionally caused many of us trouble since version 1.4.1, but none of us have been able to pin it down enough to make a bug-report.  So the short-term solution might be to try a couple more times until the phantom forces disappear.

The best advice that I have seen, for avoiding it in future builds, is here:

 

 

[bewing]

If you watch the video, it's pretty clear that it's not a collider problem in this case. The two docking ports are sticking nicely out beyond everything else. It definitely looks like some kind of problem with the port "magnetism". The question is why?  

[Foxster]

Make absolutely sure that you don't have any parts clipped inside (outside) near the docking ports. This is where I've had the problem in the past. The mesh of the part can extend beyond the physical appearance and block the port. 

Even those drogue 'chutes might be too close. 

Edited December 19, 2018 by Foxster

[bewing]

Tried an experiment putting drogue chutes really close to (but not on) a shielded docking port. The docking worked fine. So I'm pretty certain it's not the drogue chutes. But the point about any clipped parts near the docking port is extremely valid.

 

[Cannon]

Thanks everyone for answers.
I checked for part clipping, it's not that. I managed to dock it in the end by aligning it so that docking ports are perfectly flat on each other. 

[Duck McFuddle]

I think this is a pretty common bug, Matt Lowne mentioned it a while back (I think during the space station stratolauncher video) so at least you're not alone. I have no idea how to fix it though.