Pt-online-schema-change increases table size

Hello, could you please help me? I have Percona Server 5.7 and latest Percona Toolkit installed.

I want to run pt-online-schema-change to get some diskspace

As per information schema I have a lot space to reclaim. Also, checking table status, I found that many tables consuming 2 GB when on OS side it occuppies 1.5 GB (this is an example)

After pt-online-schema-change run I see that table status shows increased table size as well as from OS side

Whats wrong? What additional information should I add?

Thanks in adnvace

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