Credit cards dropped off my file

Hi, I’ve been paying off a massive debt in credit cards for about 15 years. I had agreements for at least five of this where I was paying £1 a month and the interest was frozen. Slowly as I began earning more I increased the payments to £100 per card with the interest still frozen. Now I’m down to a debt of around £12k paying £700 a month off. What I’ve noticed recently though is all the companies I’m payknh have disappeared from my credit file. I used to be able to keep tabs on the outstanding balances but now they aren’t showing. Can anyone explain why? Also am I sill liable for the debt? I will continue to pay regardless as I believe I owe the money and should pay it back hence why I never went bankrupt years ago but am curious as to why I can’t see the info any more. Thanks for your help.