I messed up on the process.
I added the malt syrup from the can. THEN hot water, and then the sugar and stirred and strirred. Whatever the “sugar” was in the box it was not regular sucrose table sugar. It had a different texture and grain. It didnt’ seem to go into solution well. Especially since I added the malt syrup first.
Then I added the rest of the water to 23L and added the yeast.
There was undissolved “sugar” on the bottom even before adding the yeast.
I’m a biochemist by trade so I’m not surprised the sugar didn’t go completely into solution considering how I made it. I’m also professionally embarrassed especially as my chemist wife watched me add the syrup then the water and sugar. I was too excited.
Sugar will eventually go into solution, but without agitation it or a stir bar it can take weeks. I’ve added 58.4g of NaCl (table salt) to a liter of water (1 molar solution) and left it over a weekend without agitation and on Monday morning the salt was still at the bottom of the bottle. If you add a stir bar or swirl the bottle the salt is completely dissolved within a minute or so.