You probably should have used a wood conditioner, such as the one from
Varathane. Softwoods have an uneven amount of resin that affects the absorption rate of stain in different parts of the wood, and the conditioner somehow evens it out. I learned this the hard way when I was finishing a pine dining room table top, and had to completely sand it down after doing the final clearcoat. I thought the varnish would even it out but it just made it worse!
If you are only staining the top and leaving the rest natural, I would give it one or two more appplications of stain for more contrast.
I have the same Bekvam cart but I did not stain it, I just put a
water based polyurethane finish and it is amazing how it has lasted for a decade despite being used as a central kitchen island. I installed long handles along the side that function as hanging rails for utensils and kitchen cloths. The slatted shelf turned out to be a perfect pot lid rack! Here's a photo of my well used ten-year-old Beckvam: