DC Offset caused by XLR adapter ?

Hello. I guess this can probably apply to other products as well. I got an L22, and recently I found out that at high levels my amplifier was going into protection. I also found out that the preamp was outputing some above normal DC. Long story short and after a long lists of tests and switching heavy equipment (doh!) I found out it was my trusty Lynx L22! I used the "Recalibrate converters" option on the Lynx mixer to no avail. After some search I found out that the XLR to RCA adapter I'm using doesn't have the same wiring as recommended on the user manual. I was going to test with a preamp with balanced inputs that I have but the wiring is also different and I don't have an adapter ready. So before I dig out the soldring iron to make some adapters to test can you guys confirm if this wiring can be the issue ? The XLR to RCA adapter that I have has pins 1 and 3 to RCA sleeve, and pin 2 to RCA center conductor. User manual says to leave pin 1 connected to cable shield only, with the other end floating).

Thanks for all the great and continued amazing support, even for older but still awesome cards that make the name Lynx worth it :)

Posting the results of some more tests in case anyone is interested.
No, it's an off the shelf XLR to RCA adapter I got from a music store some years ago.
The other preamp with balanced inputs I mentioned above ended up having the exact same XLR wiring and that solved the problem, so I'm happy again. Funny that I had been running the L22 like that without even noticing! The pre itself is actually not balanced internally, it's got an internal adapter from XLR to single ended so I'm guessing it's was indeed the adapter not being adequate.