Possible Bug: Multiple THUD engines report wrong ISP with altered fuel priority?

[BigFatStupidHead]

I have noticed than when using multiple THUD engines on a rocket where I have altered the fuel tank flow priorities, that the ISP changes dramatically than when using a single THUD or any other engine or engines.

https://imgur.com/a/wmlW5kc

KSP 1.7.1 + Breaking Ground + Making History

Create a rocket with multiple fuel tanks and attach two THUDs.

Alter fuel priority on one fuel tank

Result:  ISP reported changes drastically.

[Serenity]

1 hour ago, BigFatStupidHead said:

I have noticed than when using multiple THUD engines on a rocket where I have altered the fuel tank flow priorities, that the ISP changes dramatically than when using a single THUD or any other engine or engines.

https://imgur.com/a/wmlW5kc

KSP 1.7.1 + Breaking Ground + Making History

Create a rocket with multiple fuel tanks and attach two THUDs.

Alter fuel priority on one fuel tank

Result:  ISP reported changes drastically.

Yeah, messing around with fuel priorities and sometimes with decouples messes up the DV calculations  .I use a mod to see the true DV but i sure hope so it will get fixed soon.There are 2-3 posts in the last month that mention the same problem so i am  guessing its not limited to few users.