Why history files are different since version 1.83.2? Shouldn't they be constant?

Zorro-1.50.6/History/EURUSD_2005.t6 11463072 bytes
Zorro-1.66.4/History/EURUSD_2005.t6 11463072 bytes
Zorro-1.74.8/History/EURUSD_2005.t6 11463072 bytes

Zorro-1.83.2/History/EURUSD_2005.t6 11501856 bytes
Downloaded-from-site/EURUSD_2005.t6 11501856 bytes

This also aplies to other EURUSD files and greatly affects test results.