The answer to 'why is my paver overgrown' is that your pavers have become overgrown with weeds, moss, or other vegetation. This is a common issue that can happen over time as plants take root in the spaces between pavers. The main causes are lack of maintenance, improper installation, or environmental factors like excess moisture.
Some common symptoms are cracks or gaps in the paver surface, uneven or sunken pavers, and a generally unkempt or unsightly appearance. To fix this, you'll need to clear out the overgrowth and either reseal the pavers or replace them entirely. For minor overgrowth, this may be a DIY job, but for more extensive damage, it's best to call in a professional landscaper or paver specialist.