I do have a bug in Saurus 2.5. It has got something to do with the knobs.
Instead of describing the problem myself, have a look at this video on yt because this guy has the same issues:
https://www.youtube.com/watch?v=sEQ8Le3wIcAThe thing is that this "knob behaviour" varies with each preset, almost any knob might be affected; in most cases it is the CUTOFF knob. Again, you can see this in the video, too.
I also have a similar GUI problem with the new 2.5 version of Electra - never had the problem with the 2.1 version. If I knew how to insert a picture here, I could upload a screenshot.
NB: I am experiencing this in the standalone versions of the two 2.5 synths, have not tried the vsts yet.