J.L.
No one has the same textured hair all over their head. It is very possible that the hair in the front is finer than other parts of your head, and is likewise more delicate and less able to tolerate heat appliances and styling.
If you use a flat iron for example, these are very harsh on hair in general compared to blow dryers and curling irons. They tend to damage hair to the core and can even change hair texture in severe cases of heat damage.
If you aren't doing so already, consider using products that protect hair from heat damage and see if that helps.
Also, as we age we can lose more hair and hair thins out too. As we approach menopause (perimenopause) many women start to notice significant hair loss. :(