Starting tomorrow (after the next automatic reboots) you may join the servers with a 1.14 client if you want to. This is ONLY to make it easier for people who don’t know how to change their version – WE ARE STILL ON 1.13.2! You will not be able to use any of the new 1.14 blocks – the server will convert them back to 1.13.2 items. It is still recommended that you play on the same version as the server (1.13.2) for the best compatibility with the server.
If you are confused, just ignore this and keep using 1.13.2.
EDIT: Some people are reporting issues switching servers when in the nether. This bug is inconsistent and can be fixed by closing your game and re-joining the server you want to be on directly instead of “switching” to it from another server.