Herbicide damage on mangos from pine bark mulch/fines in my custom mix?

[Mark in Texas]

All my fairly young PIN mango trees are showing what I suspect is broadleaf herbicide damage due to mixing in and top dressing the pots with pine bark mulch, Lowe's Landscaping brand and another one from a local lumber yard which was pine bark fines.  What I don't understand is why some of the leaves are huge and perfect and others on the same plant are twisted and cupped like this Pickering.
 


Here's an old pot with 3 varieties on what was a Mallika, now Turpentine - Pineapple Pleasure, Juicy Peach and Orange Sherbet growing very well.  2 mos. ago I put the OS on it and it's already on its 3rd set of leaves - bottom right.  Has to be the mulch, right?   

[FruitFreak]

The tree looks healthy to me other than the cupped leaves which I have seen on some of my trees. They always seem to eventually normal themselves out.  Maybe varieties are pulling nutrients and hormones from others?

[Mark in Texas]

The tree looks healthy to me other than the cupped leaves which I have seen on some of my trees. They always seem to eventually normal themselves out.  Maybe varieties are pulling nutrients and hormones from others?

Hi Marley, am 99% sure the damage is from compost tainted with a broadleaf herbicide.  It ruined my veggie garden, a total loss this year.  Am mitigating it with a really heavy drench and sowing Bluestem prairie grass seed in the pots.  Trick is to let it grow well, chop at ground level before seeding and dump the stuff.   Grasses will uptake the herbicides.  They act as an accumulator.