Hi i´ve found the problem

was the memory size of the php, was setted to 128M, so i have upgraded to 1024M an it works!!

the server ran out of memory and when i hit F5 the data was duplicated

the platform was installed and never been upgraded, i have the work to upgrade but to upgrade to moodle 3 i have to upgrade to 2.2 first.

thansk for the answers!!