Q-Link not working correctly

Aloah

I bought an used MPC 2500 with installed JJ OS 5.43 recently.

Now as i got more into the workflow and used more than one slider an odd error occured.
Only one always works.
(I´m pretty sure it worked before as i remember putting tune on q1 and q2, with a broad note-on setting (-120-120) on q1 and a finetuning one on q2 (-10+10)
EG: I set tune to q1, everything is fine, but when i set something to Q2-4 only that new setted thing works, when i turn the slider (Q2-4) off q1 is working again.
Same happens if i use q4 (q3 or q2 too) as first thing, as soon as i define a second slider the first stops working.

i seriously hope this is a common error and i just oversee something which logically explains that

quite stoned at the moment, hope its not too hard to read

Try installing the latest OS, which is 5.54. Then report back if there are still problems.

i bought my mpc 2500 on ebay ( and got it check out at vst) etc .....
and this still happens i think its a common error i hardly play with the q link thouuuu