Incorrect asteroid weight problem

[MZ_per_X1]

I have a contract to capture and land a class A asteroid on Kerbin.
So far so good. Docked and I have the asteroid in tow. I have circurarized around Kerbin. It's a class A asteroid so weighed 5 t. I thought using a command pod could land it without mining. Well it couldn't. So I sent a ship, docked and mined it dry. Asteroid weight showed 0.7t. At this point I had command module, parachutes (about 12), large reaction wheel, some solar panels attached. Just the basics. It still wasn't slowing down when I tried to aerobrake about 20 times. This is when I noticed under staging that the total weight of the asteroid and the command pod was about 160t.
I undocked the command pod, showed as 8t. Asteroid showed as 0.7t. I docked again and the weight jumped up to 160t again. Am I going mad? Does the game think it's a class D asteroid? How on earth can I land it like this? I am losing my mind.

[18Watt]

Unfortunately, it appears this is a known bug:  https://bugs.kerbalspaceprogram.com/issues/25730

If you read that bug report, Neilski posted a method which may have worked temporarily for him.

[MZ_per_X1]

Thanks for the link. I am on console so it won't be fixed anytime soon. 

[AHHans]

Well, actually, I think it is the original bug #24855. (I.e. small asteroids have an effective mass of 150t instead of the mass they should have.) Unfortunately the things you can do are the same: wait until @SQUAD fixes the bug.

Well, one thing you can do is upvote the bug(s) on the bugtracker: Prioritizing Bugs in the Bugtracker