In many places in the siddur there are Lameds with a flat top, and there are some with a straight top. For example in the last הללוקה the word בצלצלי, the first lamed is with a straight top, and the second is with a flat top. Why is it like that?
I believe (having heard this from teachers in elementary school) that this is independent of grammar and entirely dependent on layout. Where the ascender of the lamed is close enough to the descender of a letter (e.g. a kuf) in the line above to touch or cause confusion, the printer may use a different version of lamed with the ascender folded back.