Serato software doesn't currently handle WMAs
This list is the supported formats for SDJ:
support.serato.com
The half/double of bps is relatively normal across different software platforms as they use their own analysis engine.
To correct manually in the case of half/double:
serato.com
Otherwise. You'll find a 'cogwheel, next to the analyse button in the offline mode of SDJ. This allows you to set an expected bpm range for tracks that may not analyse correctly.