Audio disappears when recording more than one track

in cubase 11 (which is really getting on my nerves)
I record an audio track eg a vocal
then when I record the second tracking vocal the first audio disappears (I am recording on separate tracks of course)
if I decide to copy and paste the first vocal nothing copies and all the waveform images disappear THIS REALLY DRIVING ME MAD I previously used cubase 8.5 without ever having issues
any solutions please
best wishes

Never sow that beforeā€¦ mac or windows, wich OS version?

thank you for responding
I am using a 2017 iMac