See if you have filled all the information correctly and if you have filled the slog sheet of attendance then you can expect no problems to occur. The OMR Readers only read the dark one and no such signature factors aren't detected by it (as per informations on internet). Thus you hopefully will not face any problem. I would recommend you to discuss this problem with your HOD or your professor, they can provide you more customized answer to Osmania University.

I hope this answer helps. All the very best for your future endeavors!