Call for help, project endangered news

EDIT: Thanks for the community help (hi, Cat!) the problem was fixed! Thank

Hi! Bad news unfortunately.

I've hit a technical problem that I can't solve. I'll explain it below, but first: if you are a GZDoom wizard, or know someone who is, I could use your help.

So here's the thing. Line spacing in dialogues is messed up. The first picture is how it should look (and how it looks on some computers, on older versions of GZDoom). The second picture is how it looks for some people, especially with the latest GZDoom, but in some instances with older versions too.

Now here's what's strange:

1. This happens only in my newer builds. Older builds look fine for everyone. But there's nothing in the dialogue interface that's changed between them.
2. Disabling custom dialogue interface doesn't fix the line spacing, so it's not a problem of the interface script.
3. Disabling custom global scripts that change the UI also doesn't fix it, so it's not a problem with them.
4. Disabling the custom player class also doesn't work.

I have zero idea about what could be causing it. There's nothing else that could affect the dialogue box.
It's like some deeply rooted bug that happened somewhere in between the builds. Since it didn't appear on my 2 computers (with differnt versions of GZDoom), I haven't noticed it. I'd have to revert months and months of work to go back to the point where it doesn't exist yet, and that's just won't happen.

If I don't fix it, there's no point in continuing with the game. So - if you can assist here, please do. I can share the builds so you can try to experiment yourself.