You shouldn't of sealed/nailed/glued the blocks in, really good job, I see you put in a board up against the building in the raised planters.
Those type of blocks (called Keystone-Legacy lipped blocks), though it doesn't seem like it, hold very very well when dry stacked well and put right up against the sides of adjacent blocks, especialy after being filled with soil/mix from behind. Also, dry stacking is really the only way to go with them, it allows for the planter or hill behind them to settle and adequatley drain through the wall during heavy rains. Most suprisingly to me, they make for very stable and sturdy retaining walls, drystacked and without anchors because if you notice they slant back as they stack up, they're lipped in the bottom back of the block so they can't be straight 90-degree stacked (specificaly the lipped Keystones). Just stack them neat and tight together and fill in behind them as you work up, I redid an old and failing wood-tie ~100' long retaining wall in my parents back yard with these same blocks about 8 years ago, 4'-tall (4'-6" total if you count the first couple of blocks that are the foundation and buried on the front face), hasn't budged a smidge and drains the hill behind it during storms a lot better than the wood ties with perforated pipe behind them ever did... I might be overhyping these blocks, but only because wood-tie planter walls and retaining walls are/were complete junk after a couple years in the weather and after being climbed upon compared to these blocks. I even saw a 50' tall (very long too, maybe 300-400' with a gentle 90-degree bow) retaining wall done last fall with the larger variety of Keystones that have a hollow space in the middle of the block to allow for planting, I'm not sure what the civil did to make such a huge dry stack meet all the code since the manufacturers don't honestly recomend using them for walls higher than 3-feet, but that may have more to do with codes out here requiring any retaining wall higher than 3-foot to be certified as professionaly engineered.
http://www.angelusblock.com/products/retaining_wall_systems.cfmhttp://www.angelusblock.com/docs/Angelus_Keystone_Landscape_Units.pdf
I'm a drafter in the Landscape Architecture/Design for about ten years now, those blocks for retaining walls or planter walls have gotten mighty popular in the last decade (they're cheap, easy to install, sturdy and most importantly they last for a very very long time).
