Hi!
I realise it's too late now to ask for a Market Locator search template that you used.
I've run a test search in Challenger Cherbourg, and all markets seem to come up in the search. The things to look at:
1. Country. If you specified a range of countries, then some of the matches may not be included if their country is unspecified (this happens to Friendlies in football, but also may happen to markets in other sports).
2. Search for up to X days. If you have this at 1.0 (by default) and a tennis match is going to start, say, in 36 hours, it won't be included in the search.
Let me know if the problem persists for you.