losing oil an d alot of back freezing

hi guys i installed water chiller plant last year there aare two 40 hp compressor and one of them is losing oil and and alot of back freezin is happenig on the compresor
-***** is 404A
-there suction accumulator
also there is oil separator

Maybe liquid is entering the compressor and is foaming the oil...? Are the compressors connected to the same circuit / expansion device?

Sandro Baptista mentioned one possibility but there are others and we need more data.

Are these compressors in parallel and share refrigerant? If so, do they have oil level regulators installed?

For one to freeze you must have lower pressure in that one, measure suction and crankcase pressure in both compressors and post it.

liquid flood back most likely cause. Is this a build-up chiller? Is it piped equal-distance? If these compressors are common to one circuit is the compressor loosing oil the lead compressor? Need more specific info to assist further.