A weird change on a route

Do you think it is strange for a bus to arrive at the end of its journey from Hastings and change route? That happened with former Triangle Bus Trident 18528 ( GX06 DYS ). It arrived at Eastbourne on a 99 from Hastings I was expecting it to continue as a 99 but instead it changed to a 98 how strange is that and a low floor bus on the 98 that is mega rare I was lucky to catch some photos of it on a 99 and a 98.

First up is an image of it on the 99 this is where the 99 drops of all its passengers after a really long journey as shown on the bus itself.

GX06 DYS on the 99

In the next photo it shows 18528 on the 98 this time the Eastbourne to Hastings 98 normally the route is operated by Step Entrance buses so seeing a low floor bus on it is really rare.

Really Rare: 18528 on the 98 

Both these photos were taken on the same day sorry for the shadow on the one of it on the 98.