Crackles on WaveLab pro 9.5

Hello
I am a new user on Wavelab and I have a problem:
I am transferring and cleaning old K7 tape.
I recorded them on reaper like this 2*mono+1 stereo in reaper
I cleaned the clicks and several noises on iZotope RX, When I listened them on reaper it was quite good, I listened them on a Cubase Le given with my sound card it was perfectly good sounding, on izotope also of course
But:
On Wavelab the two mono tracks have crackles at close intervals (like at the time of windows xp more than 10 years ago) without any plugins
If I mix the three tracks on reaper I have no problem on wave lab.
I need this configuration because I would like to use the multiband compressor furbished with wavelab
any suggestions ?

Can you zoom-in and see a defect?