Buckets lenght varies, Error phase 3 plotting?

Hi, during phase 3 plotting, buckets lenght varies, possible error?

Bucket 102 QS. Ram: 3.251GiB, u_sort min: 0.078GiB, qs min: 0.024GiB. force_qs: 1
....
Bucket 127 QS. Ram: 3.251GiB, u_sort min: 0.750GiB, qs min: 0.299GiB. force_qs: 1
......
Bucket 81 QS. Ram: 3.251GiB, u_sort min: 0.750GiB, qs min: 0.285GiB. force_qs: 1
Wrote 3439810865 entries

but, chia plots check does not detect any errors!!

windows 10 pro
8GB RAM (memory 95% with one plot)
chia 1.2.3

error?
120 plots (May-July)
 0 XCH farmed, 0 Proofs Found