False red alerts with breathing bands

We have been using breathing wear with our now 10-week-old son from the start. The swaddle has worked really well for us but our pedi has recommended to stop swaddling now. The problem is, for some reason we get false red alerts with breathing bands pretty much every night we try to use them. It is very frustrating especially since they wake up everyone in the house. We are using blank crib sheets. Tried the bands over long sleeve footed pj’s, over a onesie and a very light sleep sack - same thing.

Has anyone had the issue with constant false red alerts using the bands? How did you solve it? There must be something I’m doing wrong but I can’t figure out what it is.