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Jay Saunders felt Maidstone gifted Eastleigh victory at the Gallagher Stadium on Saturday.
United led 1-0 and 2-1 with goals from Johan ter Horst and Stuart Lewis but ended up losing 3-2.
Saunders was frustrated with all three Eastleigh goals.
The first was scored by Ayo Obileye after a corner was played to the edge of the box.
Ryan Broom made it 2-2 after Lee Worgan fired Seth Twumasi's backpass straight to the Spitfires substitute.
And Oblieye headed his second after Stones switched off from a late corner.
Maidstone dropped a place to 14th in the National League after an 11th game without a win.
Boss Saunders said: "It's three bad goals if you look at it. All three are bad goals.
"I was quite comfortable in the game.
"When you're on top and you don't take your chances it's going to come back and haunt you and at the end there, they're massive so it was always going to be a problem from set-pieces today.
"The second goal's the disappointing one for me because at that point they've not hurt us.
"I honestly don't think other than their first goal Worgs has had a save to make and then it's a poor set from Seth I think, fired back at Lee, it's a poor kick from Lee and the fella scores and the third one's just poor marking.
"If you've got the chances we've had today again you have to convert them because the simple facts are we aren't keeping clean sheets so if you're not keeping clean sheets you've got to at least take your chances at the other end.
"The worrying thing for me at the moment is we aren't good enough in both boxes and that's the long and short of it. You control large parts of the games but we're not good enough in both boxes.
"Then again, you score two goals at home, you expect to see the game out and, as I say, all three goals were bad."
Read the match report from Maidstone's 3-2 defeat by Eastleigh