Camomile Dilemma

[Tillyboo]

I have a squiggly pathway with a few old stepping stones dotted about and last year I planted camomile to grow inbetween as a feature.
Some of the plants are OK and have joined up nicely but on one particular side of the pathway the plants have dried up and look dead in the middle. However, at the end of the tuberous shoots that grew last year we have small healthy green rosettes of foilage growing which are actually 'taking' and rooting in the soil.
Is this normal or should I cut my losses and either choose different plants or replace with new camomile plants.
It's odd because a lot of the plants are OK but on one side of the pathway they have suffered. Could ants be the culprit ? I think there may be nest nearby as we get the fine earth appear on top of the grass and soil - and bloody ants !
Our soil is quite heavily clay in some places but underneath the pathway is clay and gravel.
We also have some thyme dotted about and this is growing well.

Don't know if it's normal or not sorry. But if you want to get it looking nice quickly, is it worth potting up the rooted shoots for future ues, and replacing the sad-looking bits with new plants - then as the little ones come on, you can use them to plug any holes?

Now why didn't I think of that ! What a brilliant suggestion, thanks so much, I'll get out there tomorrow and sort it out