Multiple changes to PHP files

Please excuse the naivety of this question…
I have received the log file (From Sucuri) of changes that have been made to PHP files on my WP site.
Having looked at it, I was wondered why I have multiple changes to PHP files all the time although no changes are made at my end.
Are the PHP files being changed? or are they just being used by the server, kicked into action so to speak.
I understand Backupbuddy would need to do this but have no idea why some of the others would.
The prime offenders are Yoast and Quform Iphorm.
If anybody could shine a light on this or point us in the right direction, I would very much appreciate it.
Any help gratefully received.
Thanks

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