first thing i would do is restore the forum back to a point before this start occurring.
As far as your ip showing up as a ip that you do not have and google is saying it's blacklisted?
i would contact google and ask them exactly what this means. i would also contact my service provider and ask them how this is even possible that you are coming up under a ip that is not yours and google says it blacklisted. i have never heard of a ip being blacklisted?
i have heard of domains.. but ip's???? banned from various sites.. ok.. but blacklisted so no sure what that can mean at all. unless it just means it's a secure or anonymous ip and you can not gather any info from it??? i realy do not know i am just guessing?
Explain to themn that you are not useing an ip changer nor are you using any proxy.
Have you tried blocking tried banning/blobking this ip? try banning the ip.
NOTE: If you ban this ip and it's reading that it is your ip then you may ban your self.. but this only the ip.. so if you try that be sure you have access to another computer so you can log back in then remove the ip ban. But be sure to try a restore first.
This is very complicated to understand because it makes no sense how an ip you do not have would be showing up as you.. unless you have someone else that knows your pass and is logging in as you the admin and causing all of this.. i mean i dont know?
And are you sure this ip is not from another computer you have logged in from?
But until you can sort out this ip where it's coming from i dont think the techs would be able to do much.. they have no idea what problem they would even be looking for and they have nothing to do with any ip's.
but i dont know..
So first try to restore your forum back to a few days befor this all start happening.
then contact google and ask exactly what this blacklisted ip means.
And also contact your service provider and ask how this is even possible for you to be showing as an ip thats not even yours and you are not useing an ip changer or proxy to change it.
That's about all i can suggest at this point.. try to get them answers, and try to restore the forum back to the point befor this start happening.
If all fails and there are no answers and or the restore dose not work. then we will have to pass this on to typlo for him to put a request in for a tech.. but befor we can do this we need as much info as possible so the techs know what there dealing with. this whole ip thing i just a bit bazaar and totally out of the ordinary.
here is the utilities link to try a restore.
https://www.forumotion.com/en/utils/