/diy/ - Do It Yourself

Not sure this is the correct thread to ask, but I have a problem with sigrok's pulseview.
I have a VCD file containing random bytes (8 wires with random values), when I try to import it in pulseview I get long periodic "idle periods" with increasing frequency like in pic, on the bottom GTKwave shows the correct signals.
I guess something wrong is happening in sigrok when reading the timestamps but going to the lines corresponding with the start of the idle periods I don't see anything out of place (and I don't expect to, considering that on the same file gtkwave is working correctly).
What could it be?