Although there was an improvement in the race performance, Horner is aware there are issues that need to be resolved ahead of the next round of races, starting with the double-header at Silverstone on August 2 and 9.
"We have some anomalies with the car that aren't behaving as we expect them to and a great deal of work is going into understanding and addressing that for the future races," confirmed Horner.
"We've got something misbehaving aerodynamically. It's a matter of understanding that and addressing that. In certain conditions, the car is behaving as expected.
"We've got some very good data from the weekend, so obviously the team will be working hard to understand and resolve it as quickly as we can."
As to whether Red Bull can close what Horner has described as "a significant" gap to Mercedes at Silverstone, Horner added: "It depends on how much performance we can unlock on RB16.
"We know that we have the fundamental basics of a decent car. It's just not behaving as our simulation tools predict that it will, and we need to understand that and make sure that we are achieving what it should be doing, which hasn't been the case."
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