SXTsq Lite 2 bad signal in close range

Hello i started to work with Mikrotik Devices recently and i’ve faced a pretty strange problem. I hard reseted the SXTsq Lite 2 Antena (because i could not access the device to configure it, the client had codes) to connect it to the AP (The AP is mANTbox 52 15s managed by Powerbox pro). The Clients decided to stop Using RADIUS as authentication method so i had to configure the antena to authenticate via PPOE.The problem is that when i hard reseted the SXTsq Lite 2 reconfigured and reconnected it to the AP the signal was very bad the user cannot establish a stable connection and i cant find a solution to the problem. The distance between SXTsx Lite 2 and mANT is 100 meters