Yep, sounds like they're doing their "thang".........mine worked the box for a few weeks......hen started to look "eggy" (ie, sorta standing with legs wider apart than normal) about May/June...etc, etc.......sitting on 4 eggs at the mo, started laying 1st week of July. Started laying 1st week of Sept last year.
As I notice these things I re-commenced daily wet mix. I'll continue this right through til weaning of the young and probably conitnue as they double clutched last season. During the hot months I make my wet mix up in ice cubes.....stays fresher.
The Littles are courting madly inside in quarantine

.......still havent finished their new accomodation.......have to get cracking......BTW.....saw one of my pairs do their "thang" upside down this morning!