Daniel mentioned this kind of problem first: https://community.webcon.com/forum/thread/960?messageid=960
We have this problem with version 2021.1.4.55 on our stand-alone server too. 2 Parameters, both mixed up.
As in Daniels post mentioned, WEBCON will fix this in the next version.
Nice weekend,
Björn
P.S.: We are trying to understand an other problem and will post it, when we could describe it:
There could also be a problem with General Business Rules - in some cases the logic is lost and we only have "Invalid Rule" as contents. Copying the code manually back -> ta-ta, it works again. So have a look there too.