It is partly a design issue.
The Walker Fire Control system is known to have this exact problem when gummed up with congealed lubricant or rust in the trigger mechanism, especially when set to trigger pull weights under 3 pounds.
The connector isn’t returning against the trigger, in part because the spring adjustment isn’t strong enough to push the connector against the trigger and in part because the connector has no positive attachment to the front of the trigger.
One solution to this is to solder or glue the connector to the front of the trigger. Another is to simply get an aftermarket trigger and be done with it.
The thing that the Remington apologists here don’t understand is that a designer has to anticipate possible failure modes (ways the item can be damaged) in his design, and try to make the failure modes fail safely. AKA (fail safe) As in, when the item has a mechanical malfunction, it will result in a non dangerous situation. The failure modes that should be obvious to the designer is dirt, water, rust, and other environmental contaminates, and their effects on equipment over the years.
When they designed the 700 trigger, they obviously did not think that little detail through.
Most guns rely on a trigger based safety restraint. It will impinge the trigger there by making the movement of that trigger impossible. It does not interfere with the hammer or other movement on down the line. If the trigger will not hold the hammer back, then the unit will never stayed in the cocked position, safety on, or off. Like the savage. The safety will not even engage if the trigger is not in the locked position. If the trigger system is rusted to the point it won’t fully engage the sear, then you can’t engage the safety in the first place. So the possibility of using the safety as a trigger is zero no mater what rust is on the trigger system, or dirt in the system.
On the rem 700 the design is such that the safety can hold the hammer in the firing position even if the trigger is unable to. That creates the condition where the safety can become an effective trigger when the trigger is even slightly contaminated, or damaged from the elements.
The reason they had to go with that type of safety on the 700 in the first place was because they could not rely on a simple trigger safety to prevent the gun from firing during normal drops, mishandling, or trigger damage. That is because there is no way to “positively lock” all the trigger elements in place to withstand drops, or mishandling while the safety was on. SO they had to have one that impinged the striker system directly to achieve a safety that made it impossible for the gun to fire when the safety was on..
Thus, creates the situation where the safety is the only thing holding the striker back after a normal drop, mishandling, or trigger damage. Thus, when you disengage the last thing holding that striker, then the gun will fire.
AKA… A seriously flawed design.