Hmmm, here is the result of the "test of the host's memory, it has some errors at the end:
Wordfence Memory benchmarking utility version 4.0.3.
This utility tests if your WordPress host respects the maximum memory configured
in their php.ini file, or if they are using other methods to limit your access to memory.
--Starting test--
Current maximum memory configured in php.ini: 64M
Current memory usage: 31.75M
Setting max memory to 90M.
Starting memory benchmark. Seeing an error after this line is not unusual. Read the error carefully
to determine how much memory your host allows. We have requested 90 megabytes.
Completing test after benchmarking up to 84.00 megabytes.
--Test complete.--
Congratulations, your web host allows you to use at least 84.00 megabytes of memory for each PHP process hosting your WordPress site.
Error received: mysql_fetch_object(): supplied argument is not a valid MySQL result resource
Error received: mysql_fetch_object(): supplied argument is not a valid MySQL result resource
Error received: Undefined offset: 1
Error received: Undefined offset: 0