I need help because I want to build a slime farm I have found chunks using a slime chunk finder. I have built it below level 40 at 14, It's a 16 by 16 area and I have triple checked my coordinates -177 -833 to -192 -848 and seed 5545643967389872387 using this website. .             I have placed jack o' lanterns spaced out on it. It is in fact 3 blocks tall. I at one point left the area more than 25 blocks away and less than 40 for about 4 hours! and not a single slime has spawned. What can I do or what am I doing wrong.
I dug a large room to specifications, 3 blocks tall and 16 blocks wide as well as long. I dug it at 10 levels above bedrock, in a location {(-240, 0) -> (-224, 16)} specified by  slime finder app. I am definitely more than 24 blocks away and less than 32 away from the spawn room, as specified by the wiki .  Yet, no slimes. I have been sitting in my location patiently listening for the moist slapping sounds of slime. I have gone in to the room every time I heard a phantom slap but still nothing.  Am I just being dumb somehow or do the minecraft lords just hate me?  If it helps/anyone cares here's my seed: 6405460532872068998
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