Hi so whenever I enter anything that is instanced my eternal flame turns back into word of glory is this intended or am I dealing with a bug?
Most likely not, but i’d make a macro, will probably implement it today when i get on.
#showtooltip
/cast Eternal Flame
/cast Word of Glory
I think it will pick up EF first to cast if available, if not it’ll cast WoG. Maybe someone with more expertise can say if there’s a better way.
When swapping from Templar to Herald it is necessary to manually go into your spellbook and put Eternal Flame on your action bar. Going into an instance should not effect what is on your bar unless you’re changing specs.
Rayzens’ suggestion to make a macro that includes both is a good idea.
Don’t know if it’s the same, but on my end I’ve noticed that the icon for eternal flame sometimes turns back into the word of glory one, but when i use it it’s indeed casting eternal flame.
So for me it’s just a visual bug with the icons.
I think that happens when you switch from Herald to Templar and back… go ahead and try it. 
I am not 100% sure but i am decently sure since EF replaces WOG and they change how spell macro-ing works a while back, using /cast Word of Glory SHOULD use EF if using Herald and then default back to WOG otherwise. So it should not required both lines, just the WOG line for the macro to work.
Unless of cos in classic blizz fashion, a bug occurs and that did not happen. But i tested it using Vuhdo and i have no need to change anything for EF to happen when i switch to Herald.
The thing is that when you learn EF, it doesn’t replace WoG in the spellbook, so it doesn’t in the action bar either. You essentially have 2 versions of the same spell (albeit different ofc) in the spellbook.
When I’m not the spec I qued for (fury spec and qued to tank a dungeon) a lot of my macros break when I zone in and the game automatically switches my spec for me. It could be similar. Try switching out of your spec and back in.
I need to check back when the game is back up but i am pretty sure the function should work for EF when u are in Herald etc etc.
Regardless, most ppl would have their bar saved to their talent loadout so if there’s really a need to, a separate macro can be done.
Personally I use the following Macro (have been since Shadowlands):
#showtooltip
/cast [@mouseover,help,nodead] Word of Glory; [@mouseover,harm,nodead] [harm] Judgement; Judgement
I’ve never changed “Word of Glory” within the macro and it’s always cast Eternal Flame/Word of Glory without any issues, even when I’ve switched from Herald to Lightsmith and back again.
I would report it as a bug if your’s isn’t changing etc.