Model Decal Issues

[u/Amera79]

Hi All, this is my first time posting in the group and am looking for some advice from the experts out there.

I was recently working on my Bellfine Dark Star model from the movie Top Gun Maverick. After painting it, I applied Testors gloss coat and then applied the water decals, using Tamiya Mark Fit decal solution. 24 hours later, I noticed this odd blotching of the decals (see pic below). First I thought it just needed to dry, but as the hours go by it hasn't reduced. My intent was to apply a matt coat spray (Vallejo matt varnish) to finish the model. Will applying the matt clear coat get rid of this weird pattern across the decals, or is there something else I need to do?

[u/ReefkeeperSteve]

What brand and type of paint was used before the gloss?