Yes, it seems to be normal. I've seen that with my Aqara Door/Window Contact sensors and my Aqara Leak sensor.
As mentioned in my above linked post, I believe what happens is: during the pairing process the value telling the hub the length the model text string is missed somehow, so extra "garbage" characters are picked up as part of the model name.
In any of my drivers that check on the ZigBee model name to do certain things, I make sure it only confirms the model begins with the relevant characters, so for example:
if (zigbeeModel.startsWith("lumi.sensor_magnet.aq2")) ...
