ggplot2 Skips tick values on the x-axis

Question

I plotted some data in a scatterplot using:

  ggplot(inp) +
    geom_point(mapping = aes(x = x, y = y, color = Level)) +
    coord_fixed() +
    xlim(30, 97) +
    ylim(28, 87) +
    theme_bw() 

Gives me the following resulting graph:

There is enough space to show all x-ticks, but it skips every other 10-increment. How do I get it to show all values on the x-ticks?