What's Happened To The Exchange Prices For Cheltenham On Oddschecker?

A very quick and not at all comprehensive look suggests Oddschecker is showing NRNB markets, which the exchanges do not have.

They also appear to have lost SBK, SpIn and SMarkets.  Problem at their (Oddschecker's) end?

Don't think so @Ramruma - on the markets I checked (eg):

https://www.oddschecker.com/cheltenham-festival/supreme-novices-hurdle/winner

they had a row at the top of the table for NRNB, and not all the 'books were ticked?

(which is bad in itself if correct, as they're marking the 'best' price per runner regardless of whether it is NRNB or not)/

Oddschecker has/had a longstanding problem with SBK/Smarkets (which I suspect was at the latter's end) in that they were still showing prices from old markets that should have been closed. Though I doubt that is the issue in this case.