Something that could be playing a big hand in this is you're sparring partner.
I feel most Judoka would agree that practicing a static throw on a Judo beginner is actually much harder than practicing a static throw on an experienced judoka because the experienced are much, much more comfortable with being thrown. Beginners tend to tense up, back up & get rigid whilst they're in the process of being thrown whereas good ukes should relax and float over a little for beginners so it doesn't feel so difficult for them. Not jumping over per say, but providing as little resistance as they can to the throw so the thrower can develop a feel for the hip placement etc.
I also echo what others have mentioned about the learning curves etc but it's also worth seeing how comfortable your partner is with being thrown and whether that's playing a part.
Regardless, keep practicing and remember, get you're hip lower than his when you throw.
I feel most Judoka would agree that practicing a static throw on a Judo beginner is actually much harder than practicing a static throw on an experienced judoka because the experienced are much, much more comfortable with being thrown. Beginners tend to tense up, back up & get rigid whilst they're in the process of being thrown whereas good ukes should relax and float over a little for beginners so it doesn't feel so difficult for them. Not jumping over per say, but providing as little resistance as they can to the throw so the thrower can develop a feel for the hip placement etc.
I also echo what others have mentioned about the learning curves etc but it's also worth seeing how comfortable your partner is with being thrown and whether that's playing a part.
Regardless, keep practicing and remember, get you're hip lower than his when you throw.