Do you have your upload bandwidth limited under Tools|Options|Uploads|Basic? If so - this can also restrict the number of upload slots.

LimeWire (and gnutella clients in general) keep track of file locations by TCP/IP address. Unless you have a fixed IP - you will be assigned a new IP each time you connect to the internet.

If the new IP you are given once belonged to someone else on the gnutella network, then you will receive messages meant for them - hence wrong file queries.

[Or it could just be incorrect message routing - it happens].

Mark