I have no doubt that this refers to BTs or something similar, and I have sometimes seen them with rather random dates, rather than the more usual 25 March - 24 March.
BTs were often handed in at the visitation (when the bishop or archdeacon went round the diocese for this and other business), so possibly some parishes simply listed all those happening between one visitation and the next. In a large diocese with a lot of parishes or deaneries to get round, the visitations might well drag on for a few months.
If you can locate the BTs for whichever parish it is and look a few years either side, you might get a clue as to what was going on.