Dominant noise in UDP RAW FM data.

[EU4BNC]

I discovered an interesting problem. If a correspondent approaches a repeater with a low signal level, then at the output of the repeater his report is 57 58 59, and in the broadcast via UDP RAW noise predominates, and the report is 45 56... I assume that the problem lies in the resampling of the modem. Is there a way to fix this?