Not really. Schools often have set times for re-screening or progress monitoring, which are usually at 4-6 (or even 8) weeks. The first month of kindergarten and first grade in particular are usually just a wash, as teachers get to know students and figure out instructional groupings. When I used to work in kindergartens, we took into the second month of school for screenings and re-screenings. If I didn't get to you until the beginning of October, instead of the middle of September, you could very well sit in the wrong group for a while, for no particular reason but timing. Expectations for learning and instructional fit are pretty low at that point. As I said, the main exception would be leaning toward overreferring and overplacing students into interventions, as a couple of weeks of it won't hurt students who don't need it, but it might make a difference to those who do.
I think the most likely scenario is that you happened to get a few weeks of fun phonics while the teachers were re-arranging their groups.
