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Can't say for sure but most shower head controls (ones with only 1 handle)have a setable thermostate in the control handle, take handle off and there is a screw that can be moved they call it a "scald control" so you don't burn your self
Check your winterizing bypass valve, if not set properly it can allow the cold and hot to mix thus dropping the temp of the water from the tap. Also, if equipped, check the exterior shower valve. If they're opened the same mixing can occur there too.