The media in the image
here looks quite ok for the potting.
Just for now, I would just remove all the sphagnum. I know that sphagnum is workable, but I prefer to not have it mixed with bark and leca balls.
And although I've never used leca before, I think I would put some leca in a material bag, and then use a big mallet to bash up the leca a bit - just to break them up - hopefully they don't get sharp edges. Then I'd try the leca 'pieces' as my potting media.
The following links lead to information that could be useful to you in future:
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You could leave the small amount of sphagnum in your mix if you like ----- which might be ok. Put more water toward the sides of the pot.
And try to not have the orchid pot sitting in any drained water.
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