Yeah I ran into nearly the exact same thing last year. A customer had one of those cheap Amazon boosters strapped to a pipe right above their alarm panel and the thing was screaming across the 2.4GHz band. Wireless contacts within 20 feet were either missing their check-ins or straight up popping false tamper alarms every few hours. Moving the antenna helped but what really solved it was switching the panel and sensors to the other frequency. Some of those consumer boosters are absolute trash for harmonics and they bleed into everything. If you ever see it again, check the sensor's RSSI numbers before you start relocating stuff. Also worth noting that the booster's power supply can cause issues on its own. I had one where the wall wart was shooting noise right into the AC wiring and messing with the panel through the transformer. Same symptoms, totally different fix.