I’m experiencing the same thing. Looking into cf7dbplugin_submits, I’m seeing field name ‘957ade62519e51a3648b5b05cd989d07’ with field_value ‘819689df9c7ad20927a31e87496c89bc’ as an example. These are legit submissions and field/value pair changes with a different 32char alphanumeric string. I’m almost suspecting some type of anti-spam plugin that might be doing this. I use WP-Spamshield and WPBruiser.
Thoughts?