Yes, that is normal. You can only travel in your country of residence on 2 of your travel days.
If you need more travel days in your country of residence, then you need to buy extra tickets from the border, or, if that's not possible, from/to the last station abroad. So think about which journeys you need to make in/through France and use your pass for the most expensive ones.
I’m also interested in this question (mostly theoretically). Is a French-resident global pass valid on a Eurostar train from London to Brussels that does not stop on the way (in particular not in Lille)? An example of such a train is the first one of the day departing at 07:41.
@Dominik Peters If you take the Eurostar from Brussels to London that will count as both an inbound and an outbound journey for a passholder with France as country of residence.
https://www.interrail.eu/en/interrail-passes/what-is-interrail/travel-your-own-country
@Dominik Peters
Apparently the info in the link I added above is wrong. Only one day of travel in your country of residence will be used if you transit the country.