Zombie pigmen keep getting angry

On the release of 1.14 we started a new minecraft realm (me and 2 friends). When I got my nether portal, I went into it, got some quartz, killed a few zombie pigmen and went out. After that I wanted to go on a quartz mining session. A ghast aggro-ed on me and I ran, but the zombie pigmen suddenly started to attack me too. Today I went into the nether again to check but it keeps happening... They keep aggro-ing...