You've not added the FTF tag properly. Just putting FTF isn't sufficient as people write that in the log when they didn't get the FTF ("Just missed FTF by 5 mins").
The FAQ gives guidance:
Why is my FTF count 0?
Or close to it.
First to Finds aren't something that is officially supported by Groundspeak, therefore we can not retrieve this data from them. What Project-GC is doing is looking for tags in your found logs. Some of those that are supported are:
{*FTF*} {FTF} [FTF]
There are some additional tags that are less official, but are supported as well. Some of those tags are required to be first in the log, some can exist anywhere. None of the above needs to be first.
Personally I normally go for "{FTF}" or if I'm including the time I found it "{FTF@1812}" but any of the above work (and others).