Training Load

The training load doesn't move, I have an Acute load number but no Chronic load number? The green line stays at 1.5 and the white dots stay at 0.

Use edge 530 on my Bike, with a Garmin HR pro chest strap.

I've been riding 1.5 hours 5days a week with 1 x Vo2 session. 1 x 2.5h hard shop ride once a week.

Any help on fixing would be appreciated